1 10 2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/7291e86760176da9f97a80315239a4a3.jpg 641053d2ac38252bfbfcd017132bdd7b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0c9848580f19fe22471cc47ec1ac97a1.jpg 17e9b388b24cd606bbd2c17dac3f4921 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/8401006c872fbdb728f5a6be5b55c412.jpg 2ea13c93c494e2bd17ea8d20b0c4ceed Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2><strong>L354<br /></strong></h2> <h2>Limestone, shelly</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Middle Jurassic<br /><h3>Location</h3> <div class="element-text">Forest Marble<br />Near Weymouth</div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text">This rock is made up of well cemented bioclasts. The bioclasts (mainly shell fragments) are poorly sorted, ranging from &lt;1mm up to a few 10s of mm.<span> </span><br />Fine-grained cement fizzes with acid, indicating that it is carbonate. It has weathered to a pale yellow-grey.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text">Carbonate fossil fragment in a carbonate cement (sparite). The laminated structure of the shells is visible in places.<span> </span><br />Cement contains some hematite (brown regions).<span> </span><br />There are a few epidote grains and some opaque areas.<br />This is a rudstone (Dunham naming system) or biosparite (Folk naming system).</div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">The shells are not in life position – they have been transported.<span> </span><br />Deposited in moderate to high energy environment.<span> </span></div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">shelly limestone</div> </div> bioclastic biosparite high energy https://wserv3.esc.cam.ac.uk/p1acollections/files/original/9c74043dd4765743a7af9b90b0f50ef4.jpg ac96894746f8137ce25d5f1f809dfa00 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/afce700bce529e295af89d899592b41e.jpg ef8d9d97da68dd0afcc64131b171809e https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0e48212f1384b76ca45fc688ba4e0b6d.jpg 0efd2cfb2ca972cc8e8ebbb0583ac682 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2><strong>L311<br /></strong></h2> <h2>Conglomerate</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Eocene<br /><h3>Location</h3> <div class="element-text">Hertfordshire</div> </div> Description An account of the resource <div class="element-set"> <div class="element"></div> </div> <div class="element-set"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text">Poorly sorted. Rounded clasts up to ~15 mm long.<span> </span><br />Pale yellow matrix of quartz grains.<span> </span><br />Cement fizzes with acid, indicating that it contains carbonate.<span> </span><br />This conglomerate is just clast-supported.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Rounded clasts of very dark red brown<span> </span><a href="/p1acollections/items/show/171">amorphous</a><span> </span>silica (chert) and<span> </span><a href="/p1acollections/items/show/242">polycrystalline</a> quartz.</p> <p>Matrix of quartz grains (typically 0.25 mm) and fine-grained carbonate cement (sparite). Dark red-brown<span> </span><span>iron staining</span>.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Deposited in a high energy environment.</div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p><span>Iron staining</span><span> </span><br />Hematite (Fe₂O₃) → red (blood-red, cherry-red, brown-red) iron-staining<span> </span><br />Limonite (FeO(OH)•nH₂O) → yellow or brown iron-staining</p> <p>The red-brown colour of this rock is probably produced by hematite.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">conglomerate</div> </div> </div> clast supported high energy